JPS61133140A - Composition for purifying water - Google Patents

Abstract

PURPOSE:To increase the flocculating force of suspended matter in the water by mixing zeolite with 0.001-1% poly-aluminum chloride or aluminum sulfate for zeolite to produce a composition for purifying water. CONSTITUTION:0.001-1% poly-aluminum chloride or aluminum sulfate for zeolite is mixed with zeolite directly or in a state of an aq. soln. Then a composition for purifying water is produced by making the mixture powdery or particulate. The granule size of the powder or the particle may be justifiable in such degree that it floats on the water surface for some time e.g. about 4-10 minutes and thereafter sinks and about <=5mm granule size is desirable. The material which consists essentially of mordenite and contains a small amount of clinoptilolite is representative as zeolite and the other various materials can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a composition for purifying water by absorbing, adsorbing or coagulating water pollutants.

The present invention relates to a composition used for preventing red tide and treating water, sewage, and human waste.

BACKGROUND OF THE INVENTION Conventionally, activated carbon, ion exchange resin, natural zeolite, acid clay, carrion, and bentonite have been used as water purifying agents.

On the other hand, polyaluminum chloride or aluminum sulfate
Used in water purification as an electrolyte flocculant.

Problems to be Solved by the Invention In recent years, water pollution problems have frequently occurred in coastal waters, especially in closed waters. Maintaining and managing water quality is important for aquaculture or aquaculture operations, and can be used to protect crops from damage caused by suspended solids in the water, organic compounds containing phosphorus and nitrogen from bottom layer pollution, harmful gases, or red tide. It is hoped that a method of defense will emerge.

Conventionally, zeolite has been known as a water purification agent.1For example, its high adsorption capacity for phosphorus, ammonia nitrogen, etc. is described in "Report on Veterinary Sediment Improvement Technology Development Test Project" edited by the Fisheries Agency, 1978, pages 38 and 125. .

In addition, it is stated in the same 86 that it is effective in maintaining DO and COD, and furthermore, it is stated in the 1978 Red Tide Countermeasure Technology Development Test Report that it has a direct effect on terancton such as red tide. (Published by Kagoshima Prefectural Fisheries Research Institute, March 1973) as shown on page 31.

On the other hand, polyaluminum chloride and aluminum sulfate are known as flocculants and have a strong effect on plankton such as red tide, but the above report shows that they are only effective at the water surface or at relatively shallow water surfaces where agitation is possible. (Published by Kagoshima Prefectural Fisheries Research Institute) It is described on pages 29 and 52.

However, no effective method has been developed for water relatively deeper than 2 to 4 meters, where stirring is difficult.

Means for Solving the Problems The present invention uses zeolite and 0.001
A composition for water purification characterized by containing ~1% polyaluminum chloride or aluminum sulfate.

The zeolite of the present invention is typically one mainly composed of 1 mordenite (mordenite) and containing a small amount of kleinobutyrite (clinobutyrolite), and various other zeolites can be used.

In preparing the composition for water purification, polyaluminum chloride or aluminum sulfate is mixed with zeolite either directly or in the form of a solution, for example an aqueous solution.

It is generally powdered or granulated. The diameter of the powder or granular particles is preferably 5 mm or less as long as it floats on the water surface for a while, for example, 4 to 10 minutes, and then sinks.

If the amount of polyaluminum chloride or aluminum sulfate is less than 0.001% with respect to zeolite, the effect will be small, and if it is more than 1%, the effect of the combination with zeolite will not be significant, and preferably 0.3 to 0. It is about 5%.

The composition of the present invention is used by spraying it on the water surface.

Various amounts are added depending on the water quality, but in aquaculture cages where red tide has occurred, aim for 0.2 to 2 kg per 1 d of water surface, and the composition sprayed on the water surface will settle and aggregate suspended matter in the water. and grow.

For improving bottom layer water, particles with a relatively large particle size of about 0.5 mm to 5 mm are suitable, and for middle layer and upper layer water, particles of smaller size are desirable.

Function In the present invention, a large number of polyaluminum chloride and/or aluminum sulfate are adsorbed or occluded in one zeolite particle, and zeolite particles that are highly charged are rapidly formed from the initial stage of addition in water, and suspended in water. The flocculation of turbidity is strong and rapid, and the sedimentation is appropriate.
It is also possible to flocculate suspended matter in water deeper than ~4 m. The surface of the zeolite particles in the composition gels in water to increase its affinity for water, and a large number of aluminum ions protrude from the gelled portion.

Activated carbon and ion exchange resin instead of zeolite.

Even if vermiculite, acid clay, kaolin, bentonite, clay, etc. are used, the gel shown in Table 1 is not formed, and aluminum ions are adsorbed or released into the water, so that appropriate particles are not formed.

Example 1 An aqueous polyaluminum chloride solution was sprinkled onto zeolite, mixed and dried to obtain a water purification composition containing 0.4% polyaluminum chloride based on the zeolite. The particle size distribution was 48-200 mesh (2%), 100-200 mesh (23%), and 75% (200) or more.

About 2,000 yellowtails weighing about 1.5 kg were being cultured in a cage measuring 7 m x 7 m x 5 m in length, width, and depth. Due to red tide, about 300 yellowtails were found to have died. After raising them, 40 kg of the composition was Sprayed with firewood from upwind to the outside of the cage.

Before the spraying, the yellowtails were in a quiet state and the dorsal fins of most of the yellowtails were blackish. However, when the spray was applied, the seawater in the cage was slightly cloudy when visually observed from the ship, but as it gradually settled, the seawater became clear after about 10 minutes. The yellowtail began to be filtered as soon as it became cloudy, and after clearing, they continued to filter energetically in groups.

At this time, no black spots were observed on yellowtail, and there were no deaths after spraying, indicating that the spray was effective. The same effect as yellowtail was also observed on benthic animals.

Example 2 An aqueous solution containing equal weights of polyaluminum chloride and aluminum sulfate was sprinkled onto zeolite, mixed and dried to obtain a water purification composition containing 0.5% of polyaluminum chloride and aluminum sulfate based on the zeolite. Particle size distribution is 8~
16 meshes 92%.

16-32 mesh was 8%.

Red tide (Prorocentrum: 700 cells/
m l) Due to the outbreak, the sea water surface turned yellow-brown and was observed to move toward the aquaculture fish cage, and the fish cage was vertical, horizontal, and 7 m deep.
5,000 yellowtails (1 kg) in the size of m x 5 m
/fish), but the next day, 700 fish perished due to red tide.

On the other hand, when 1. 40 kg of the water purification composition was sprayed upwind of the fish tank, the yellow-brown red tide settled together with the cloudiness of the water purification composition, and the seawater behind the water became clear and the yellowtail in the fish tank was actively filtered. started. There was also no effect on benthic animals.

Applicant (430) Nippon Soda Co., Ltd. Nisso Shoji Co., Ltd. Seiwa Development Co., Ltd.

Claims (1)

[Claims] A water purification composition containing zeolite and 0.001 to 1% polyaluminum chloride or aluminum sulfate based on the zeolite.